A problem of tremendous import confronts the social scientists of our day. Having accumulated a vast amount of detailed data on human relations the social scientists are now being asked about the significance of their data. Two major aspects of this questioning are these: How can we synthesize all available scientific data on human relations so that this knowledge can be successfully applied to the solution of current social problems; and secondly, since some of the data accumulated so far has been defined and organized in terms of concepts imitative of older (Newtonian) physical (and sometimes biological) concepts—the appropriateness of which to human relations as subject matter is questionable—should we not evaluate these basic concepts with a view to laying new conceptual foundations for our knowledge of human relations? Thus we shall open the way for new social research and at the same time develop a methodologically sounder basis for our knowledge of human relations. Briefly, our knowledge of human relations at present is at loose ends, and in this condition is not as applicable to the solution of pressing social problems as it would be if it were unified into a comprehensive and more flexible science of human behavior. Such a unification would demand not only a synthesis of the data of the social sciences but also the critical evaluation of many of the basic concepts of these sciences.